<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <label for="theme">select theme: </label>
    <select name="" id="theme">
        <!-- <option value="balck">balck</option> -->
        <!-- <option value="green">green</option> -->
        <option value="tomato">tomato</option>
        <!-- <option value="pink">pink</option> -->
        <option value="skyblue">skyblue</option>
    </select>
    <p>just test validate</p>
    <script src="../js/4.js"></script>
</body>
</html>